I don't think you can say with any certainty at all that "comfortably a majority" of Americans use Uber, especially given that relatively paltry 28% monthly. I

I don't think you can say with any certainty at all that "comfortably a majority" of Americans use Uber, especially given that relatively paltry 28% monthly. I understand some people use Uber infrequently, but I think you'll need something more substantial than anecdote to demonstrate that moves the needle more than a percentage or two overall.